Thereafter when you create a ticket, there will be new textfield to key in the users you want to restrict from accessing the ticket.

Example

For example I have some users which I have assigned to 3 groups

grpA

grpB

grpC

user1

user1

user4

user2

user3

user5

A user can belong to more than a group. In the ticket view, I have created an additional field to enter a comma delimited list of groups I should restrict access to the ticket.

For example when I am creating a new ticket, I decide that grpA and grpC should be restricted from viewing the ticket. I just enter a comma delimited list of groups I should restrict. This is shown in the image below

And then the ticket will be hidden from users in these 2 groups.

In our example, only users from grpB (user1 and user3) are allowed to see the ticket. However user1 has already been restricted due to him belonging to grpA, so in effect, only user3 has access to the ticket

Note that if a user has TRAC_ADMIN permissions then he will be allowed full access regardless of the restrictions imposed by the plugin